add more useful msg to nbdev_export

Author: hamelsmu

nbdev/doclinks.py

@@ -143,6 +143,8 @@ def nbdev_export(
     **kwargs):
     "Export notebooks in `path` to Python modules"
     if os.environ.get('IN_TEST',0): return
+    if not is_nbdev(): raise Exception('`nbdev_export` must be called from a directory within a nbdev project.')
+    path = Path(path or get_config().nbs_path)
     if procs:
       import nbdev.export
       procs = [getattr(nbdev.export, p) for p in L(procs)]

nbs/api/05_doclinks.ipynb

@@ -362,6 +362,8 @@
     "    **kwargs):\n",
     "    \"Export notebooks in `path` to Python modules\"\n",
     "    if os.environ.get('IN_TEST',0): return\n",
+    "    if not is_nbdev(): raise Exception('`nbdev_export` must be called from a directory within a nbdev project.')\n",
+    "    path = Path(path or get_config().nbs_path)\n",
     "    if procs:\n",
     "      import nbdev.export\n",
     "      procs = [getattr(nbdev.export, p) for p in L(procs)]\n",
@@ -576,24 +578,24 @@
       "text/markdown": [
        "---\n",
        "\n",
-       "[source](https://github.com/fastai/nbdev/blob/master/nbdev/doclinks.py#L216){target=\"_blank\" style=\"float:right; font-size:smaller\"}\n",
+       "[source](https://github.com/fastai/nbdev/blob/master/nbdev/doclinks.py#L226){target=\"_blank\" style=\"float:right; font-size:smaller\"}\n",
        "\n",
        "### NbdevLookup.doc\n",
        "\n",
        ">      NbdevLookup.doc (sym)\n",
        "\n",
-       "Link to docs for `sym`"
+       "*Link to docs for `sym`*"
       ],
       "text/plain": [
        "---\n",
        "\n",
-       "[source](https://github.com/fastai/nbdev/blob/master/nbdev/doclinks.py#L216){target=\"_blank\" style=\"float:right; font-size:smaller\"}\n",
+       "[source](https://github.com/fastai/nbdev/blob/master/nbdev/doclinks.py#L226){target=\"_blank\" style=\"float:right; font-size:smaller\"}\n",
        "\n",
        "### NbdevLookup.doc\n",
        "\n",
        ">      NbdevLookup.doc (sym)\n",
        "\n",
-       "Link to docs for `sym`"
+       "*Link to docs for `sym`*"
       ]
      },
      "execution_count": null,
@@ -670,24 +672,24 @@
       "text/markdown": [
        "---\n",
        "\n",
-       "[source](https://github.com/fastai/nbdev/blob/master/nbdev/doclinks.py#L221){target=\"_blank\" style=\"float:right; font-size:smaller\"}\n",
+       "[source](https://github.com/fastai/nbdev/blob/master/nbdev/doclinks.py#L231){target=\"_blank\" style=\"float:right; font-size:smaller\"}\n",
        "\n",
        "### NbdevLookup.code\n",
        "\n",
        ">      NbdevLookup.code (sym)\n",
        "\n",
-       "Link to source code for `sym`"
+       "*Link to source code for `sym`*"
       ],
       "text/plain": [
        "---\n",
        "\n",
-       "[source](https://github.com/fastai/nbdev/blob/master/nbdev/doclinks.py#L221){target=\"_blank\" style=\"float:right; font-size:smaller\"}\n",
+       "[source](https://github.com/fastai/nbdev/blob/master/nbdev/doclinks.py#L231){target=\"_blank\" style=\"float:right; font-size:smaller\"}\n",
        "\n",
        "### NbdevLookup.code\n",
        "\n",
        ">      NbdevLookup.code (sym)\n",
        "\n",
-       "Link to source code for `sym`"
+       "*Link to source code for `sym`*"
       ]
      },
      "execution_count": null,
@@ -729,7 +731,7 @@
       "text/markdown": [
        "---\n",
        "\n",
-       "[source](https://github.com/fastai/nbdev/blob/master/nbdev/doclinks.py#L238){target=\"_blank\" style=\"float:right; font-size:smaller\"}\n",
+       "[source](https://github.com/fastai/nbdev/blob/master/nbdev/doclinks.py#L248){target=\"_blank\" style=\"float:right; font-size:smaller\"}\n",
        "\n",
        "### NbdevLookup.linkify\n",
        "\n",
@@ -738,7 +740,7 @@
       "text/plain": [
        "---\n",
        "\n",
-       "[source](https://github.com/fastai/nbdev/blob/master/nbdev/doclinks.py#L238){target=\"_blank\" style=\"float:right; font-size:smaller\"}\n",
+       "[source](https://github.com/fastai/nbdev/blob/master/nbdev/doclinks.py#L248){target=\"_blank\" style=\"float:right; font-size:smaller\"}\n",
        "\n",
        "### NbdevLookup.linkify\n",
        "\n",